<?php
/**
 * 输出列中不包含去重列异常
 * @author xiao<admin@end.wiki>
 * @time 2017-10-09 11:36
 */
 namespace exception;
 
 class OutputColumnsMustHasDistnctColumn extends \Exception{
	protected $code = 401;
	protected $message = '输出的列中必须包含去重的列';
 }